Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		51 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016
Summary Of Significant Accounting Policies [Line Items]
Impairment of investments			$ 0
Based on these sales prices reduced inventory and increased cost of goods sold			1,100,000	$ 1,100,000
Based on excess and obsolete adjustment, reduced inventory and increased cost of goods sold	$ 2,300,000		2,300,000
Revenue recorded from government contract	80,000	$ 270,000	289,000	$ 556,000	$ 4,300,000
Total value of the contract	4,700,000		4,700,000		$ 4,700,000
Estimated costs expected to be incurred in excess of contract value	$ 217,000		$ 217,000
Number of outstanding warrants	0		0		0
Penang, Malaysia Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Based on excess and obsolete adjustment, reduced inventory and increased cost of goods sold	$ 4,000,000		$ 4,000,000